/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --primary: #1A56DB;
      --primary-hover: #1E40AF;
      --secondary: #0F172A;
      --accent: #F97316;
      --accent-hover: #EA580C;
      --bg-page: #FAFBFD;
      --bg-white: #FFFFFF;
      --bg-light: #F8FAFC;
      --text-heading: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-on-dark: #F1F5F9;
      --border-light: #E2E8F0;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.06);
      --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.12);
      --radius-md: 12px;
      --radius-sm: 8px;
      --transition: 200ms ease;
      --max-width: 1280px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* ----- 导航 (Header) ----- */
    .site-header {
      background: var(--bg-white);
      height: 64px;
      display: flex;
      align-items: center;
      box-shadow: var(--shadow-sm);
      position: sticky;
      top: 0;
      z-index: 100;
    }
    
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      font-size: 28px;
      color: var(--primary);
    }
    
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      transition: color var(--transition);
      position: relative;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      transition: background var(--transition);
      border: none;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: background var(--transition);
    }
    .btn-outline:hover {
      background: #EFF6FF;
    }
    
    .btn-accent {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 16px;
      transition: background var(--transition);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
    }
    
    /* 汉堡菜单 */
    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--text-heading);
    }
    
    .mobile-menu-overlay {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: white;
      z-index: 200;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
    }
    .mobile-menu-overlay.active {
      display: flex;
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 28px;
      color: var(--text-heading);
    }
    
    /* Hero 区块 */
    .hero {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 60px 0;
      gap: 40px;
      background-image: radial-gradient(circle at 20% 30%, rgba(26,86,219,0.03) 0%, transparent 30%);
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 380px;
      border-radius: 24px;
      box-shadow: var(--shadow-md);
      position: relative;
    }
    .hero-right::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,86,219,0.1) 0%, rgba(15,23,42,0.05) 100%);
      border-radius: 24px;
    }
    h1 {
      font-size: 44px;
      font-weight: 700;
      color: var(--text-heading);
      line-height: 1.2;
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 28px;
    }
    
    /* 区块通用 */
    section {
      padding: 70px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 620px;
      margin: 0 auto 48px;
    }
    
    /* 痛点卡片 */
    .pain-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .pain-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      flex: 1 1 250px;
      transition: all 300ms;
      display: flex;
      align-items: flex-start;
      gap: 16px;
      border-left: 4px solid transparent;
    }
    .pain-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-left-color: var(--accent);
    }
    
    /* 解决方案模块 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .solution-img {
      flex: 1 1 40%;
      background-size: cover;
      background-position: center;
      border-radius: 20px;
      min-height: 300px;
      box-shadow: var(--shadow-sm);
    }
    .solution-text {
      flex: 1 1 60%;
    }
    
    /* 数据看板 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      justify-content: center;
    }
    .stat-item {
      background: var(--bg-white);
      padding: 32px 28px;
      border-radius: var(--radius-md);
      text-align: center;
      flex: 1 1 180px;
      box-shadow: var(--shadow-sm);
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
    }
    
    /* 证言 */
    .testimonial-card {
      background: var(--bg-white);
      padding: 28px;
      border-radius: var(--radius-md);
      display: flex;
      gap: 20px;
      align-items: flex-start;
      border-left: 5px solid var(--primary);
      margin-bottom: 24px;
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      padding: 16px 8px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      background: transparent;
      font-size: 16px;
    }
    
    /* 页脚 */
    .site-footer {
      background: var(--secondary);
      color: var(--text-on-dark);
      padding: 60px 0 24px;
    }
    
    @media (max-width: 1024px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .hero { flex-direction: column; }
      .solution-row { flex-direction: column; }
    }